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====== Installation ======
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Before going ahead, be sure to follow the upgrading instructions if you're using
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an older version of pamusb.
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===== Requirements =====
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* Requirements for pam_usb and pusb_check:
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* libhal-storage
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* libxml2
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* Requirements for pusb_hotplug and pusb_adm:
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* python2.4
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* python-celementtree
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* python-dbus
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* python-gobject
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===== Installing from sources =====
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* Step 1: Download the latest release
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* Step 2: Unpack the distribution tarball
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$ tar -zxvf pam_usb-<version>.tar.gz
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$ cd pam_usb-<version>
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* Step 3: Compile and install
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$ make
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# make install
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====== Configuring ======
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===== Devices and Users =====
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* Copy the default configuration file to /etc/pusb/pusb.conf:
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cp /etc/pusb/pusb.conf-dist /etc/pusb/pusb.conf
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* Once you've connected your USB device to the computer, use pusb_adm to add it
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to the configuration file:
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# pusb_adm --add-device MyDevice
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Name : MyDevice
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Vendor : SanDisk Corp.
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Model : Cruzer Titanium
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Serial : SNDKXXXXXXXXXXXXXXXX
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Volume UUID : 6F6B-42FC (/dev/sda1)
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Save device to /etc/pusb/pusb.conf ?
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[y/n] y
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Done.
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Note that MyDevice can be any arbitrary name you'd like.
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If more devices are connected, pusb_adm will ask you which device you want to
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use.
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* Edit your /etc/pusb/pusb.conf config file to add the users:
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<users>
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<user id="root">
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<device>MyDevice</device>
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</user>
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<user id="scox">
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<device>MyDevice</device>
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</user>
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</users>
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* In order to test if everything went fine, we're gonna use the pusb_check tool
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which will simulate an authentication event.
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# pusb_check -a -u root -s su
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* Authentication request for user "root" (su)
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* Device "MyDevice" is connected (good).
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* Performing one time pad verification...
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* Verification match, updating one time pads...
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* Access granted.
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===== PAM Module =====
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The PAM module pam_usb.so is used to let applications authenticate you using
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your USB device instead of asking your password. The default password-based
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authentication will be used as fallback if the device authentication goes wrong.
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You don't need to setup the hotplugging feature as pam_usb.so and pusb_hotplug
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are independent of each other.
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* Depending on the operating system you're using, you have to tell PAM to use
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pam_usb.so as default authentication method. There should be a file named
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either common-auth (Gentoo) under /etc/pam.d/. If you do NOT have neither of
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those files, you'll have to edit each pam.d service file you want to use (e.g.
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/etc/pam.d/su, /etc/pam.d/gdm and so on).
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* Locate the following line on /etc/pam.d/common-auth or /etc/pam.d/system-auth:
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auth required pam_unix.so nullok_secure
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* And change it to look something like that:
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auth sufficient pam_usb.so
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auth required pam_unix.so nullok_secure
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* You should now be able to authenticate the users configured in pusb.conf using
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your USB device:
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scox $ su
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* pam_usb v.SVN
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* Authentication request for user "root" (su)
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* Device "MyDevice" is connected (good).
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* Performing one time pad verification...
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* Verification match, updating one time pads...
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* Access granted.
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* Try to authenticate to a different application. pam_usb.so should work with
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any application using xscreensaver and many more).
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===== Hotplug =====
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Hotplugging is a feature provided by pusb_hotplug that allows you to
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automatically execute commands upon locking and unlocking events. Those events
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are generated when you insert or remove your authentication device.
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For instance, you could automatically start your screensaver as soon as you
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remove the device, and deactivate it when you plug the device back:
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<user id="scox">
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<device>MyDevice</device>
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<hotplug event="lock">gnome-screensaver-command --lock</hotplug>
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<hotplug event="unlock">gnome-screensaver-command --deactivate</hotplug>
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</user>
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Replace gnome-screensaver-command --lock and gnome-screensaver-command --unlock
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with any command you want to execute. You can also execute more commands by
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adding extra <hotplug> entries.
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$ pusb_hotplug
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pusb_hotplug[18329]: pusb_hotplug up and running.
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pusb_hotplug[18329]: Watching device "MyDevice" for user "scox"
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pusb_hotplug[18329]: Device "MyDevice" has been removed, locking down user
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"scox"...
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pusb_hotplug[18329]: Running "gnome-screensaver-command --lock"
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pusb_hotplug[18329]: Locked.
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pusb_hotplug[18329]: Device "MyDevice" has been inserted. Performing
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verification...
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pusb_hotplug[18329]: Executing "/usr/bin/pusb_check -q -c /etc/pusb/pusb.conf -u
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scox -s pusb_hotplug -a"
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pusb_hotplug[18329]: Authentication succeeded. Unlocking user "scox"...
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pusb_hotplug[18329]: Running "gnome-screensaver-command --deactivate"
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pusb_hotplug[18329]: Unlocked.
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Depending on your desktop environment, you have to add pusb_hotplug to the list
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of autostarted applications so it will be started automatically.
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For instance, with GNOME:
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- Open System -> Preferences -> Sessions
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- Select Startup Programs and press Add
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- Enter pusb_hotplug and press OK
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- Press Close
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====== It works - What next ? ======
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* Have a look at the configuration documentation
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